Spoiled rich kid Fausto Fitzwinkle wants a unique present for his 13th birthday, and he gets it in the form of the demonic doll called Mechastopheles! But the terrifying toy has an evil mind of its own, and it's up to junior occultist Martin Magus and the supernatural giant robot MegaGhost to save Fausto and the town of Dunwich Heights from the arcane action figure's possessed playset!